Improvement in adjustments of planing-machine tables



UNITED STATES PATENT OFFIQE.

EDWARD F. GORDON, OF CONCORD, NEW HAMPSHIRE, ASSIGNOR TO JOHN A. WHITE,OF SAME PLACE.

IMPROVEMENT lN ADJUSTMENTS 0F PLANlNG-MACHINE TABLES.

Specification forming part of Letters Patent No. 221,805, dated November18, 1879 application filed October 27, 1879.

To all whomrt't may concern:

Be it known that I, EDWARD F. GORDON, of Concord, in the county ofMerrimack and State of New Hampshire, have invented certain Improvementsin the Mechanism for Raising and Depressing the Tables for Buzz-Planers,of which the following is a specification, reference being had to theaccompanying drawings, which are hereby made a part here- In thedrawings, Figure l is a side view of part of my mechanism. Fig. 2 is adiagram, illustrating the principle on which it is constructed; and Fig.3 shows the manner in which I adjust my rollers, as hereinafterexplained.

Referring to Fig. 1, 0, represents the circle described by the knives ofa buzz-planer; 70 k, the knives t, a table; 4" a, rollers, upon whichthe table moves, 0 is an angular arm, fastened to the under side of mytable, having a slot in the front thereof, which passes down in a groovein the screw 8, so as to rise and fall with the table, while the screwremains stationary. frepresents a part of the frame of the machine, inwhich the screw 8 works.

I g g are bearing plates or guides, which move upon the stationaryrollers r r.

It will be seen that as the table is drawn back from the knives by theaction of the screw 8 it will descend till the rollers take efiect onthe straight part of the guides or hearingplates, and the edge of thetable will descend upon the arc of a circle, such that it will be aconstant distance from and parallel to the circle described by therevolution of the knives.

For a full illustration and demonstration of this principle I refer toFig. 2.

A is the center of revolution of the knives. From A erect theperpendicular A B, and lay off B 0 equal to half the opening desired tobe given in the table, and draw A G. From the center of the roller Rdraw RD parallel and equal to A O. From R describe a circle the size ofthe roller, and with D as a center de-' scribe the are E F, touching theperiphery of the roller, and from E draw E G parallel with the top ofthe table. As the table is drawn back it will descend upon a circlehaving a radius, R D, and the edge next the knives will move upon acircle parallel with the circle of revolution of the knives until thestraight line E G touches the roller, when the table will move inastraight line away from the knives. The centers upon which the rollersrevolve are fixed in eccentric studs as 00, Fig. 3, which are confinedin the position to which they may be adjusted by the set-screws, one ofwhich is shown at y.

This device is necessary because of the extreme difiiculty, amounting toan impossibility,

of drilling the holes for the axes of the rollers by suitable mechanism,substantially as set forth.

2. The combination of the guides or bearing-plates g g, rollers r rangular arm 0, handwheel and screw s, for the purpose of raising anddepressing the table, as described.

3. In a mechanism for raising and depressing planer-tables, the studs acas, having holes eccentrically arranged for receiving the ends of therollers r r, and the set-screws g y, substantially as set forth.

E. F. GORDON.

Witnesses;

CHAS. G. LUND, HoRA'rro Homes.

